Motor-controlling rheostat.



PATENTBD MAY 7, 19o?.

P.. J. SEAB'OLT. MOTOR GONTROLLING RHBOSTAT.

APPLICATION FILFD JAN. l4. 1907 I rwenorj .eabol 2kg ACLY 'simple and efficient manner.

.UNITED srATns PATENT orrrcn FRANK J SEABOLT, OF SCHENECTADY, N EIN YORK, ASSIGNOR- TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

`nnCron-CONTROLLINe RHEOSTAT.

To all whom t may concern:

.Be it known that I, FRANK J. SEAnoLT, a citizen of the United States, residing at Schenectady, county of Schenectady, State of New York, have invented certain new and useful Improvements in Motor-Controlling Rheostats, of which the following isa speciiication.

This invention relates to devices -for controlling electric motor circuits and has for its obj ect the provision of a device of this character in which the lstarting and the speed regulation of the motor may be accomplished in a In carrying out my invention I provide in connection with the starting and speed regulating resistances, a single controlling arm adapted to control both of said resistanesv and thereby accomplish both the starting and speed regulation. The contacts of the starting resistance are arranged in a row parallel with those of the regulating resistance and adjacent thereto, and the controlling arm or member is arranged to engage both rows of contacts simultaneously. QIn order that the conti oll'ing member sha-ll be effective to vary only one resistance-at a time, I rovide means whereby one resistance is 's iort circuited while the other one is being varied. As the `member moves in one direction, las for instance during the starting movement, the regulating resistance is short circui'ted while duringthe speed regulating movement the starting resistance is short circuited. I also provide means whereby upon the occurrence of abnormal circuit conditions vthe controlling arm is returned to the oli or protective position with reference to the motor.

In the accompanying drawing in which I have shown one embodiment of my invention, Figure 1 is a plan view of a starting and regulating rheostat embodying my improveg ments together with the proper circuit connections and Fig. 2 is a detail of the operatin0r mechanism.

eferringto the drawing, l is an insulating base of slate or soapstonel provided with concentricallyarranged resistance contact studs 2 and 3. The studs 2 form terminals of starting resistance 4 while the studs. 3 are similarly connectedl to the regulating resistance 5. The resistance' 4`is designed as a starting resistance to beconnected m'series with the Specification of Letters Patent.

Application filed January 14,1907- Serial No. 352,115.

Patented May 7, 190'?.

motor armature only while the motor is coming up to speed, whereas the resistance 5 is designed to be constantly in circuit if desired. This` resistance 5 is preferably arranged in the eld circuit so as to regulate the speed of the motor by varying the iield strength.'

The circuit connections of these resistancesA are such that, as the arm 6 is moved to 'the ri ht, the starting resistance 4 will be gradualIy cut out of the armature circuit while when it is4 moved to the left theregulating resistance 5 will be cut in. In order that the regulating resistance 5 shall not be varied as the arm moves to start the motor, I provide means for short circuiting this resistance during the starting movement. This short-circuiting may be accomplished in various ways but I have found that a very'convenient method of producing this result is to arrange a contac stud 8 an spring-pressed switch-arm 9 so that current will pass directly to the iield and short cir cuit the resistance 5. Then the running position is reached, contact is broken between the contact S and switch 9 thereby. opening the short circuit. An arm l0 is arranged to be moved by the arm 6 as the latter moves to running position, and is provided with a brush l0 so that when it reaches the running position the brush l0 will make contact with stud 12. Stud 12 has electrical connection with the last one of the studs 2 and is likewise electrically connected to a binding post which forms an armature terminal. The arm l() being a conducting element, when it reaches the stud l2 current will pass through the arm l() to the stud 12 and thus short 01rcuit the stud 2 and starting resistance 4.. The. arm l() vtheretore When it reaches the running position `it breaksthe short circuit on the 'resistance 5 and at the same time short circuitsthe starting resistance 4.' yThe arm 6 may then be moved in a reverse direction and vary the resistance 5 without affecting the resistance 4. This particular arrangement of arm 10 for shifting the short circuit from one resisthas two functions.-

IOC

that it muy he otherwise connected il deence to the other hes e vfurther advantage that the erin i() may he used to return the erin to the storting position. The arnr l is provided. with e. spring 'il tending to return it to the ofil posi ion. The two arms (i and il) are concentricelly 'pivoted end nieve in the saine plane so that the engaging ll/ ol the erin l() cerises the erin (i to nieve the erin lli in one direction and also causes the erin 10 to niove the erin in the opposite direction. The erin l() is provided with en Sirniziture 13 adopted to engage the pole-pin. ol e noevoltege nnignet 14 when the erin is on the stud 12. The magnet 14 thus nntintains the short circuit. of thesarting resistance when Sulliciently energized. When it releases and allows the erin l() to return the hitter carries with it the erin 6. I have shown the retirining1 magnet ifi connected across the line one terminal being grounded et the pivotal point or' switch 9 although it is perfectly oovious aired.

'lhe operation of my device und the errangement of circuits is as follows: Normally the devicestends us shown in lull lines in the drawing with the erin 6 held ege-inst the stop l ny the erin i() and spring` il. To start the niotor erin() is moved h v the handle lo to the right gradually ci ingr out starting resistance, the current passing troni the line at li through the coniiluctor i? to center pivot 7 thence through erin G. ri istsince conductor lil, to armature A. und bench to line et L. At the sinne time iield'current posses from the pivot 7, through urni it?, to studs` 2, thence through the starting resistance, con duetor 19, switch Si, stud Spthrou 1 the Alield l? :ind hack 'to line. rPhe field resistance is thus short circuited 21s the erin G is inovcd to the right. YJhen the running position is reuched the erin l() posees on to the Stud l2 and is held there by the retainingy iiv'fnct lll. The erinziture current now pues Vroni the pivot directly to stud l2 through the erin ll), thence to the ernniturc A through conductor 20. rihe switch .ll being novf'lyree es Shown in dotted lines the lield cinrent passes Vlroin the jivot 7 rind urns li lo the studs 3, and imc to liuc through conductor 2l. Bv nonV 'n'irwiini the erin l to the lelt the re iirnce 5' will he inserted in the iield circuit :ind 'the motor speeded up. Jpon failure ol voluioe the erin l( will he release-.d und in re tu nino to The oll position will corri' with ii irin t?.

will thus hc seen that l herve provided e simple und convenient arrangement for holh storting und regulering the speed oi n inotor, both operations heilig performed h v u Single continuing ineinhcr, ineens heine' :ilse nro- Zh'lf i lor returnii'ig seid er to the oli' poet- 'ion the occurrence oi eflniorinul circuit The controlli -u erin during the regulating movement is free to he inoved in is released that thc controlliin;l erin is placed under spring tension.

TWhile l have in :uncorduncc with the pnlent Statutes shown spocilic ineens l'or currying out Ind' invention, it should he underM stood that l do not liinit my invention to thc specilic construction or :nruiugcinent oll circuits herein shown' und described since this nnry ho varied by one skilled in tl nrt without departing troni the spirit olI lny invention, the scope ol which is set l'orth in the iinnexed claims.

flint l cleini as new :ind desire lo secure by .Letters Patent ol the United Slides, is,W

l A controlling device for electric circuits comprising u puir ol` rcsietinmes provided with contactey :i controlling?r incinhcr sinnlltzineously engaging said contacts, and connections 'lor rendering seid inelnhcr inell'cct ivo in controlling?r one ol' said rcsistonces when inoved in one direction :ind the other ol' sind resiste-ricos when inoved in the opposite direction.

2. A inotor storting and crmtrollingjr rlicostat comprising :in armature resistance ond u, field resistance euch provided with conlncls7 :i controllin;l incnihcr siniullzincouslir engine'- ing scid contacts, sind connections l'or rcndering` sind incniher ine'llcctivc to control one ol. seid. resiszinces when inorcd in one direction und 'the other ol' said rcsislzinccs when inoved in the opposite direction.

3. A inoLor storting und controllingr rhcostint comprising :in arnmtnrc resislzincil :ind :i lield resistenc(l erich provided with conlucls,

e controlling incinher silnultmuiousl)Y en iigrini@r said contacts, und .,onncclions whcrch) seid ineinher is inovuhle in one dircclion lo control the starting resist/zinco und in the opposite direction to control the lield resistance.

4. A motor sterliney :ind controlling rheostat (',oinprisingnr iin :u'nniture resistance und :i lield resistance ouch provided with conlztclsJ :t controllingv nieniher siniultuneously enougine ,sind contacts, und connections Whereh)Y seid nielnher is .rnovzihle in. one direction lo cnt ont stz'ntiiig resistance and in the opposite direction to cu t in licld resistzince.

5. A controlling device l'or electric circuits comprising;- :i plurality ol rcsietuimee provided vvith contecis, a.controllinpr nioinher siinultzinconslyenge-ging sind contzicts,-ineinis for eliort-circuiting one of sand rr-isistzirncos :is the clement is nioved in one direction, rind. incline i'or short-cireciting another oll said ree sistem-,es :is the element is moved in. the opposite direction.

(i. 'i controlling; device l'or elect ric circuits roinp; in g i puh olt resisluncee, :i coi'itrolliiig nienihcr therefor, ineens lor short-eircuiting one of' seid minces :is the element is inoved in one direction, und ineens for open- IOO , resistance and in the opposite direction to cut in field resistance, and means for antoniaticing seid short-circuit and simultaneously short-circuiting the other resistance when the i element reaches a predetermined position.

7, A controlling device for electric circuitsl rising an armature resistance und :i iield resistance, a single controlling nrm therefor, connections whereby the armature i,

resista-nces shoit-circuited as the arm isi moved in one direction and the field resistance short-circuited as itis moved in the opy posite direction, and ineens for returning the erin to the ott position upon l'inlnre ol' vol- 8. A controlling device tor electric. motors comprising n. pair of resistiinces, :i controiiing member therefor, connections for rendering said member ineffective in controlling one ol said resistances when moved in ontl direction and the other of said resistnnces when moved m the opposite direction, and means lor zintometically placing the resistnnces in :i procontrol ot said resistances upon the occurl rence of abnormal circuit conditions.

10. A motor starting and controlling rheostat comprising an armature resistance and e lield resistance, a controlling member therefor, connections whereby said member is movable in one direction to cnt ont starting ally returning said member to the ott' position upon the occurrence ot abnormal circuit cen- -ditions.

11.` A controlling device for electric circuits comprisingr a pair of resistances having conta-cts arranged in parallel rows, a controiling member movable over seid contact-s sind simultaneonslyT engaging the same, and con-- ncctions whereby sind element is ineffective to control one of said resistances as it isl to return t ie firm when moved to a predetermined position in onedirection and ineffective to control the other resistance when biouglit beck by e return movement.

l2. A controlling device for electric cir cuits comprising apeir oiircsistiinces heving contacts arranged iii concentric rows, a piv-` oted controlling member moviible over seid contacts and simultaneously engaging the saine, and connect-ions whereby said element is ineiiective to control one of seid resistrmces as it is moved to a predetermined position in one direction and ineffective to control the other rcs' tence when brought beck by a return mo\ einem, f

i3. )i controlling device for electric circuits comprising resistance contacts arranged in concentric rows, a pivoted controlling nrm movable over seid contacts and simultaneously' engaging the saine, and connections wherebiY one of seid rows is short circuited when the :irrn is moved to n predetermined position in one direction :ind :mother oi" said rows short circnited dnring the return movement.

14. A controlling device for electric eircuits coniprising re istiiiice contacts arranged l in concentric rows, :i pivoted controlling firm inovnble over seid contacts and simnltniieousl): engaging the same. connections i-vhereby one of said rows is short circiiitedwhen the nrin is moved to n` predetermined position in one direction :nid :mother oi" seid rows short circnited during the return movement, and means l'or moving` said :irm ont of. ene giigement with said contacts upon the 'failure ot" voltage.

i5. A motor starting and controlling rheostat comprising :in armature resistance and it lield resistance, a cont-r iling member therefor, connections viivhereb)Y siiid member is movable in one direction to coiitioi the storting resis `ance and in the opposite directioi f control the lield resistance, ineens for retnrnm ing said member to the cii position, m. ineens for rendering sind returning ineens in opere ive after running conditions have been` established until the occurrence ot nhnorme circuit conditions.

16. motor starting and controiiing rhm stat comprising en arnnii nre resistance mi iieid resistence, n` pivoted controliing therefor, connections whereby seid fniem2 v is movable in one direction to eut ont ing resistance end in the opposite direetioi cnt in ield resistance, a spring for returning seid arm to the cti' position, magnet tor rendering sa set Vilitiiess Benin .in HULL, 'i'iiiiiin @nieren 

